Hi All,
this question about design, for example now I have some process that load
task list and try process each task, it looks like this:
import scala.concurrent.{ExecutionContext, Future}
case class TaskId(processorName: String, id: String)
case class TaskDetails(id: TaskId, status: String, json: String)
trait DAO {
def loadTaskIds(processorName: String): Future[Seq[TaskId]]
def loadTaskDetails(id: TaskId): Future[Option[TaskDetails]]
def deleteTask(id: TaskId): Future[Boolean]
def markSuccess(id: TaskId): Future[Boolean]
}
class Processor(name: String, dao: DAO, implicit val ec: ExecutionContext) {
def process(): Unit = {
dao
.loadTaskIds(name)
.map(_.map {
case taskId =>
dao.loadTaskDetails(taskId).flatMap {
case None =>
delete(taskId)
case Some(task) if task.status == "success" =>
delete(taskId)
case Some(task) =>
doProcess(task).flatMap {
case true =>
dao.markSuccess(taskId).map {
case true =>
Some(task)
case false =>
// log.error(...)
None
}
case false =>
// log.error(...)
Future.successful(None)
}
}
}).map {
case processingFutures =>
Future.sequence(processingFutures).map(_.flatten).map {
case completedTasks =>
// log.info(s"Processing '$name' tasks, complete
[${completedTasks.map(_.id).mkString(", ")}]")
}
}
}
private def doProcess(task: TaskDetails): Future[Boolean] = ???
private def delete(taskId: TaskId): Future[Option[TaskDetails]] =
dao.deleteTask(taskId).map {
case true =>
None
case false =>
// log.error(...)
None
}
}
My question: how I need to change this code for getting 'True' Actor based
application without using futures or ask pattern.
PS: I read that I need use only actor tell (!) but I can't understand how I
can rewrite my logic and DAO as an actor.
With best regards, Vladimir.
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